Formation of Volcanoes-
1.Magma rises up through cracks or weaknesses in the earths crust
2.Pressure builds up inside the earth
3.When this pressure is released, e.g as a result of plate movement, magma explodes to the surface causing a volcanic eruption.
4.The lava from the eruption cools to form new crust
5.Over time, after several eruptions, the rock builds up and a volcano forms.
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